0-dark-thirty

English

Noun

0-dark-thirty (uncountable)

  1. (chiefly US military slang) Alternative form of oh dark thirty.
    • 2002, Jonathan Shay, Odysseus in America: Combat Trauma and the Trials of Homecoming:
      In the very early morning--0-dark-30--the veterans have the Wall entirely to themselves, which is the main reason that we go at that hour.